The complete setlist for Lady Gaga's 'Mayhem Ball,' as revealed in her tour's opening night at T-Mobile Arena in Las Vegas, ...

Lady Gaga pitted the past against the present in the spectacular opening of her 'Mayhem Ball' tour in Las Vegas.

Ashlee Simpson is kicking off her seven-show I Am Me Las Vegas residency, as she’s set to take the stage on Friday, Aug. 29, ...